[issue 12]: Provide a UI feature and Doc feature 

https://github.com/LorenzoBettini/xsemantics/issues/issue/12

Change-Id: Ic89ee584c491953de97dc4210837dfe970623c7c
incremented version 1.4.2

Change-Id: Iefc8262c7eb67e98a4e672101cb1fad5dcc7b719